LTC3864IMSE#PBF

Frequency - Switching:	50kHz ~ 850kHz
Base Part Number:	LTC3864
Supplier Device Package:	12-MSOP-EP
Package / Case:	12-TSSOP (0.118", 3.00mm Width) Exposed Pad
Operating Temperature:	-40°C ~ 125°C (TJ)
Control Features:	Current Limit, Enable, Frequency Control, Power Good, Soft Start
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	No
Duty Cycle (Max):	100%
Series:	--
Voltage - Supply (Vcc/Vdd):	3.5 V ~ 60 V
Output Phases:	1
Number of Outputs:	1
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tube

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LTC3864IMSE#PBF Application Field and Working Principle

Introduction:

The LTC3864IMSE#PBF is a highly integrated, low-noise and high-efficiency, pulse width modulation (PWM) regulator designed for a very wide range of applications such as power management, automotive and robot drives. The switch mode step controls the output voltage of a synchronous buck converter. It features a high efficiency peak current mode control with moderate line and load transient response. The device has a wide operating frequency range of 3-200Khz with a programmable frequency interface which allows for fine-tuning of the system. Additionally, it includes a high-side FET diagnostics.

Application Field:

The main application fields for the LTC3864IMSE#PBF series are in the sectors of power management, automotive systems and robot drives.For power management, the LTC3864IMSE#PBF series is used for step down converters, in which high efficiency and low noise operation can be expected.For automotive systems, the LTC3864IMSE#PBF series can be used on constant current battery chargers, boosting and buck-boost converter applications that require a wide range of high power or higher currents.Finally, for robot drives, the LTC3864IMSE#PBF series is suitable for AC drives, brushless DC and DC motors, as well as variable speed drives.

Working Principle:

The working principle of the LTC3864IMSE#PBF range is based on a Pulse Width Modulation (PWM) voltage regulation, in which the output voltage is adjusted by varying the duty cycle of the pulse.The onboard oscillator allows for a wide range of output voltage frequencies up to 200kHz, with a programmable frequency interface for additional system tuning.The PWM switching sequence is also adjustable to meet specific system requirements.The step-down converter includes a MOSFETs gate driver, which is responsible for providing gate signals to the two power MOSFET switches. The gate driver includes a programmable slew rate, making the system operation even more efficient.The device includes a temperature based cycle-by-cycle current limit, a programmable minimum on-time for controlled startup, as well as under voltage lockout protection.

Conclusion:

The LTC3864IMSE#PBF is a PWM regulator with a wide range of applications specialized in the sectors of power management, automotive systems and robot drives. Its wide operating frequency range allows for fine-tuning of the system. Additionally, the PWM switching sequence is adjustable to meet specific system requirements. The device includes a high-side FET diagnostics and protection system, as well as other features for optimum operation.

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